100 UI/UX Tips - This is a collection of Dos and Dont's for making your UI better.
100 days of SEO - An actionable SEO tip to your inbox each day
100 in 100 Challenge - Get 100 new paid users in 100 days
Plug & Play by Swapstack - Pre-approved affiliate deals for all newsletter creators
Steps - A steps app that promotes some competition
UserInterface.io - Weekly UI/UX tips in your inbox for free